file_rat.rb

#!/usr/bin/env ruby


filename = '/Users/sanderson/tmp/foo.txt'

class FileRat

  def self.rat_tail(filename)
    file = File.open filename 

    # end of file (fast-forward)
    until file.eof?
      str = file.readline
    end

    loop do
      begin
        until file.eof?
          str = file.readline
          if str =~ /uccess/i
            msgstr = <<END_OF_MESSAGE
        The thing worked! #{str}
END_OF_MESSAGE

            require 'net/smtp'
            Net::SMTP.start('mail.media.edmunds.com', 25) do |smtp|
            smtp.send_message msgstr, '[email protected]','[email protected]'
            end

          end
        end
      rescue EOFError => e
        # 
      end

      sleep 1
    end
  end
end

if $0 == __FILE__ do
  FileRat.rat_tail ARGV[0]
end